My breakthrough to deeper pow on tele (which really isn't much different than fixed heel) is shorter radius turns which increases speed down the fall line. This is where weighting and unweighting and shifting one's center of gravity back a bit can create a bouncing rythmn which will slow you down a bit and help with each turn. Mostly, I go along with the ride and have a blast wiping out when it gets too fast or I get too tired.
Big turns across the fall line in deep pow, unless you are traveling at mach speed, are to hard to initiate and wear me out, leading to more wipe-outs. My stance has to be tight or the skis wander. I have to get the bounce to break free of the snow to initiate my turns. My crud strategy is real low, tight and fast.